Encyclopedia of Global Resources part 124 provides a wide variety of perspectives on both traditional and more recent views of Earth's resources. It serves as a bridge connecting the domains of resource exploitation, environmentalism, geology, and biology, and it explains their interrelationships in terms that students and other nonspecialists can understand. The articles in this set are extremely diverse, with articles covering soil, fisheries, forests, aluminum, the Industrial Revolution, the . Department of the Interior, the hydrologic cycle, glass, and placer mineral deposits. . | 1136 Spain Global Resources In 2009 British scientists presented a design for a gravity tractor that would fly close to an asteroid surface and through gravitational influence alone over perhaps fifteen years make changes in the orbital path of such a body. If a near-Earth object or small asteroid were on a collision course with Earth such a spacecraft placed close to its surface could avert a deadly global catastrophe. A 9-metric-ton gravity tractor however could not be used to bring a resourceladen asteroid into Earth proximity for convenient mining operations. Charles W. Rogers and David G. Fisher Further Reading Clarke Arthur C. The Snows of Olympus A Garden on Mars. London Victor Gollancz 1994. Davidson Frank Paul Katinka I. Csigi and Peter E. Glaser. Solar Power Satellites A Space Energy System for Earth. New York Wiley Sons 1998. Elbert Bruce R. Introduction to Satellite Communication. 3d ed. New York Artech House 2008. Fogg Martyn J. Terraforming Engineering Planetary Environments. Warrendale Pa. Society of Automotive Engineers 1995. Handberg Roger. International Space Coinineice Building from Scratch. Gainesville University Press of Florida 2006. Harris Philip Robert. Space Enterprise Living and Working Offworld in the Twenty-first Century. New York Praxis 2009. Johnson Richard D. and Charles Holbrow eds. Space Settlements A Design Study. Washington . National Aeronautics and Space Administration 1977. Karl John. Celestial Navigation in the GPS Age. New York Paradise Cay 2007. Kendall Henry W. and Steven J. Nadis eds. Energy Strategies Toward a SolarFuture A Report of the Union of Concerned Scientists. Cambridge Mass. Ballinger 1980. Lewis John S. Mining the Sky Untold Riches from the Asteroids Comets and Planets. Reading Mass. Addison-Wesley 1996. Olla Phillip ed. Commerce in Space Infrastructures Technologies and Applications. Hershey Pa. Information Science Reference 2008. Olsen R. C. Remote Sensing from Air and Space. New York SPIE Press 2007. Pop .
